[s-cars] A/C strength, 93 S4

[Pram]

Jerry:

It was a specialty AC shop.  Yes my car uses the old R12.  The  
mechanic has the schrader valve adapter.  Initially he could not find  
the valve.  My trusty Audi mechanic was the one that pointed him to  
the valve location.

You have to jump the pressure switch to allow the compressor to  
engage when it was being charged (with the engine on of course).  In  
my car there is no other port anywhere else, that is why you have to  
evacuate the whole freon and then put in 1100±100gr of R12.  It took  
longer than a regular recharge due to the evacuation process.

HTH,
Pram
92S4

On Jul 27, 2006, at 2:01 PM, Jerry Scott wrote:

> Pram
> I assume that you have a R12 system.  Did the mechanic have a fitting
> that would connect to the schrader valve?  What was the effect of
> jumping the pressure switch?  Was the car running or stopped when
> recharging the system?  Isn't there also a port at the compressor? Was
> this an Audi dealer or an A/C specialty shop?
> Thanks
> Jerry
>
> Pram wrote:
>
>> JR:
>>
>> Just to add to my earlier response about the low freon.
>>
>> I have a 92S4.  Back in 1997 my S4 started to have the recirc button
>> kept going off.  My trusty Audi mechanic right  away told me to add
>> Freon and that solve the problem right away.  Then in 2004 it started
>> with the same symptom again but I was too lazy to add Freon since I
>> do not use AC that often.  Well this summer (2006) the weather got
>> really hot here in So Cal that when I turn on my AC the compressor
>> kept recycling every 15-25 secs  (Recirc button does not even  
>> engange).
>>
>> I took it for a freon recharge and now the AC is cool and everything
>> is working like normal (including the recirc button).
>>
>> Just be cautious when you take your car to the AC guy since on my
>> 92S4, there is only one port for the Freon (most car has two port,
>> high side and low side).
>>
>> The port is located between the firewall and the front windshield
>> (passenger side).  You have to unscrew the pressure sensor and there
>> will be the port with schrader type valve.  Since you only have only
>> have one port, the proper way to accurately recharge the AC is for
>> the AC technician to suck (vacumm) all the Freon from the system and
>> add about 1100±100gr of freon.  Plus you need to put a jumper on the
>> pressure sensor while charging.
>>
>> Some AC technician will simply add freon from that single port but it
>> is going to be difficult to know it is too much or too little having
>> only one port.
>>
>> HTH,
>> Pram
>> 92S4
>>
>>
>> On Jul 26, 2006, at 9:06 AM, JR wrote:
>>
>>
>>
>>> What does it mean when the compressor seems to cycle on and off   
>>> every
>>> few seconds or so?  Also, when I press recirc, it just shuts recirc
>>> right back off immediately.  It will not stay on recirc.
>>>
>>> JR
>>>
>>>
>>>
>>> Ernest Seow wrote:
>>>
>>>
>>>> The key to good AC is make sure you have sufficient high side
>>>> pressure when
>>>> you know the system is fully charged. If the low side is too low
>>>> and the
>>>> highside is too high with the correct charge, then replace the
>>>> orifice tube
>>>> if you haven't already done so. Its the cheapest part. They tend
>>>> to clog as
>>>> the car get older from normal debris wear from the compressors.  
>>>> Also
>>>> replacing the accumulator will help also. An old accumulator  
>>>> that is
>>>> saturated will tend to drop efficiency. Over time, moisture still
>>>> gets into
>>>> the system from the rubber hoses, thats why most AC shop replace
>>>> them. Also
>>>> make sure your system is running on recirc, and not fresh air, so
>>>> check the
>>>> flap to make sure it operating. When ambient temps rise above 80+
>>>> deg, the
>>>> cooling temp will rise also. There is a chart to check this with
>>>> Audi/VW
>>>> vehicles. The design drawback of the UrS4/S6 AC is that the AC
>>>> system is
>>>> placed outside in the plenum, not inside under the dash like newer
>>>> vehicles,
>>>> so also makes the AC not as cool. I might attempt insulating my AC
>>>> casings
>>>> as its very hot and humid here in Florida.
>>>> Rgeards,
>>>> Ernest
>>>>
>>>>
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>>>>
>>>>
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